INTRODUCTION. 
Tuis Volume contains an enumeration of the species of the following Families 
of Rhynchota-Heteroptera—Tingitide, Phymatide, Aradide, Hebride, Hydrometride, 
Henicocephalide, Reduviide, Nabide, Anthocoride, Ceratocombide, Cimicide, Saldide, 
Pelogonide, Gelastocoride (Galgulide), Nepide, Naucoride, Belostomide, Notonectide, 
and Corixide. ‘The first twelve of these belong to the Gymnocerata (Geocorise), 
concluding that portion of the work contributed by Mr. Distant in Vol. I., and the 
remainder to the Cryptocerata (Hydrocorise). 7 
The Tingitide include a large number of species, all of small size, some of them 
having the pronotum inflated, the margins of the latter, and the scutellum and elytra 
also, being often more or less diaphanous, with very conspicuous nervures. But 
little attention has hitherto been paid to the tropical forms of this family, and it is 
therefore not surprising that sixty-six of the seventy-eight species enumerated prove 
to be new, with seven new genera. Lethierry and Severin in their Catalogue (1896) 
give 335 species for the whole world. Of the American genera characterized by Stal, 
all but three are represented. | i 
The Phymatide is a well-marked family of small extent, its members having very 
strong raptorial anterior legs. Some of the species are gregarious, and they have the 
habit of secreting themselves in flowers for the purpose of securing the small insects 
that may come within reach. Three genera and nineteen species are enumerated, one 
of them, Agreuocoris nowalhieri, being probably eastern, though said to be from 
Mexico; eight species are treated as new. Herr A. Handlirsch’s Monograph of these 
interesting Hemiptera was issued immediately after the publication of my own 
enumeration of the Central-American forms ; the lithographic plates accompanying his 
work were drawn by Baron Max v. Schlereth, and they are perhaps the most beautiful 
delineations of Heteropterous insects that have ever appeared. 
